Reversible die head



July 26, 1932.

w. JENKINS REVERSIBLE DIE HEAD Filed Jan. 15, 1950 2 Sheets-Sheet l y1932- w. A. JENKINS I 1,363,750 I REVERSIBLE DIE HEAD Filed Jan. 15.1930 I 2 Sheets-Sheet 2 J 5 g .Q.

2 30 i (I $1 22 I ll 1 31 E I 1 l 2 36 Y 8 20 29 E (A? 5Z5 21 22 1OPatented July 26, 1932 unites stares Parent easier f REVERSIBLE DIE HEADApplication filed January 15, 1830. Serial No. 420,895.

. simple, practical and inexpensive die head upon which is mounted aseries of thread cutting dies or chasers and the latter belng mounted onreversible base blocks in order that the same head may be convenientlyem ployed for cutting right or left hand threads on a pipe, rod or thelike.

The subject matter herein described and claimed is an improvement on thethread cutting die forming the subject matter of U. S. Letters PatentNo. 1,652,67 3 issued to me December 18th, 1927.

Further objects of my invention are, to generally improve upon andsimplify the constrnction of the existing forms of thread 1 cuttingdies, further, to provide simple and eflicient means for simultaneouslymoving the sliding die carrying blocks or bases radially in bothdirections relative to the pipe, rod or other member upon which a threadis being cut, further to provide simple and eificient means for verysecurely and rigidly fastenin g the cutting dies or chasers upon thesliding base blocks and further, to provide a convenient light weightand eiiicient thread cutting die that may be used as a hand stock or ina thread cutting machine.

With the foregoing and other objects in View, my invention consists incertain novel features of construction and. arrangement of 1 parts thatwill hereinafter be more fully described and claimed and illustrated inthe accompanying drawings, in which:

Fig. 1 is a view looking against the front face of a die stock embodyingthe principles of my invention.

Fig. 2 is a side elevational view of the die stock.

Fig. 3 is an elevational View of the rear side of a portion of the bodyof .the stock and showing the rear faces of the radially moveable diecarrying base blocks.

Fig. 4; is an elevational view looking against the front face of thebase plate of the stock.

Fig. 5 is an enlarged cross sectional View taken approximately on theline 55 of Fig. 1. v

Fig. 6 is a detail cross section taken on the line 66 of Fig. 1. n

Fig. 7 is an elevational sectional View taken on the line 77 of Fig. 5.

F ig. 8 is a front elevational View of the sliding base block adjustingring.

Fig. 9 is a side elevational view of the adjusting ring.

Fig. 10 is a diagrammatic View illustrating the relative positions ofthe die cutters or chasers when properly assembled on. the body of thestock and which cutters are slightly oifset relative to each other inorder to cut threads of the desired pitch.

Referring by numerals to the accompanying drawings which illustrate apractical embodiment of my invention 1O designates a disc in the centerof which is formed an opening 11, and projecting rearwardly from saiddisc around said opening is a short tubular member 12 that may bemounted in a suitable chuck or support 13 when the stock is utilized inconnection with a machine.

Formed integral with and projecting outwardly from the edge of the disc10 are oppositely arranged sockets 14 that receive handles 15 when thedie cutter is used as a hand stock.

Formed through the body of disc 10 are concentric arcuate slots 16that'are disposed at diametrically opposite points and preferably atright angles tothe sockets 14.

Arranged on the front side of the disc 10 which functions as a housing17 that is secured to face plate 10 by screws 18 and formed in the outerportion of this housing and extending from the opening 19 in the centerthereof to the outer edge of said housing are grooves or channels 20that are undercut or dove-tailed in cross section, thereby formingradially disposed ways for the base blocks 21 that carry the cutters orChasers. These base blocks 21 are shaped so as to correspond with theshape of the ways 20 and formed on the rear or in, ner face of eachblock is a pair of grooves 22. These grooves are slightly curvedlengthwise and one groove of each pair curves in face plate is a ringvided with a plurality of longitudinally the opposite direction from theother groove of said pair. 'Both grooves extend across the rear face ofthe block in a direction that is slightly inclined with respect to theaxis or longitudinal center line of the bloclr. T he members of eachpair of grooves occupy positions equi-distant from the ends of theblock. Arranged between the face plate 10 and the housing 17 is a blockadjusting ring provided adjacent to its central opening 24: at shorttangential lugs 25 that are adapted to engage in the grooves in theblochs21;

Projecting rearwardly from' ring 23, through the slots 6, are threadedpins or studs 26 and mounted on the outer portions of these studs andbearing against the rear side of face plate 10 are winged nuts 27,thereby providing means for looking the ring 23 to the face plate afteradjustment.

As illustrated in the drawings I prefer to.

use four or more of the blocks 21 and in order that the cutters orchasers'that are mounted on said blocks shall properly er age the pipeor red upon which the thread is being cut and impart the proper pitch tosaid thread it is necessary to arrange the cutters or chasers atdifferent distances away from the face of housing 17 and further, thatthe cutters or Chasers be mounted so that their axes are slightlyinclined with respect to the axis of the die head. r

In order to provide the proper mounting for the cutters or chasers thethickness of the blocks is increased progressively or in succession asillustrated in Fig. 10 and projecting outwardly from the outer face ofeach block is a stud 28 that is slightly inclined with respect to theface of housing 1'? and which latter occupies a plane at right angles tothe axis of the tool. Each stud 28 is areisposed slits 29 that intersecteach other the outer faceof the outer portion of each stud is providedwith longitudinally disposed corrugations 30. V V

Mounted on each stud is a thread cutter or chaser 31 and a portion ofthe periphery of eachcutter' is removed to form an areuate notch orrecess 32, and thecorner 33 between the shoulders at the ends of thisnotch or recess and the threaded periphery of the cutter or chaser 31constitutes the thread cutting edges of said cutter.

Formed inthe outer face of the body of the cutter 31, around the openingtherein, is a recess 34, the bottom of which is inclined with respectto. the flat parallel faces of the cutter and positioned in said recessis a split ring 35 having a corrugated inner face that is adapt ed toengage the corrugated face on stud The rear face of ring 35 is inclinedto corre spond with the inclination of the bottom of recess 34 and thuswhen the ring is posinoes and a tioned in the recess and retainedtherein between head 36 of a tapered screw 37 that is screw-seated inthe stud 28 said ring 35 and the cutter 31 cannot rotate upon the stud.

The threaded bore for the reception of the tapered screw 37 extendsaxially through the stud 28 and as said screw is screwed into the borein said stud the portions that are separated by the splits 29 will bemoved radially outward sons to firmly grip the cutter positioned on saidstud and at the same time the corrugations 30 on the stud will engagethe corrugations on the inner face of ring 35 thereby locking the latterin position and as said ring is thicker on one side "than on the otherand the recess3l in the cutter is shaped to receive said ring the latterand the cutter will be very securely held in position on the stud whenthe screw is tightened therein.

Formed on the outer face of ring 35 an the corresponding face of thecutter 31 are marks 38 which may be a proper setting of thec'utter andtapered ring upon the stud.

Ring 23 is firmly'secured by tightening the winged nuts 27 and the en'-gagenient of the lugs 25 in certain of the slots 22 in blocks 23 firmlyhold said blocks against radial movement and the cutters or chasers 31are locked to the studs 28 that project from the blocks 21 by the screws37.

lVhen properly assembled and adjusted the tool may be used as a h andstock or on a machine for cutting threads on a pipe, rod or the like andduring operation the cutting edges engage the pipe or red and cut autilized in effecting thread thereon... The proper pitch for the threadis accomplished by arranging the cutters so that they are slightlyoffset in succession, as illustrated diagrammatically in Fig. 10 and bymounting said cutting discs so that their axes are slightly inclinedrela tive to the axis of the tool.

Afterthe parts of thc'teol are properly assembled, the blocks 21carrying the cutters or chasers 31 maybe simultaneously andcorrergondingly moved inward or outward by rotation of the ring 23 andas said ring is rotated'the lugs 25 slots 22 will impart radial movementto the die carrying blocks and after proper adjustment the adjustingring is locked by tightening the winged nuts 27 or studs 26.

V V The cutters or chasers 31 after being properly adjusted on theslotted portions of the studs 28 are rigidly secured to said studs bymeans of the tapered rings or washers 35 that occupy the recesses 3d andby the tapered bolts 37 that are screwed into the slotted studs.

The formation of the notches or recesses 32 cutting edges.

engaging one set of the By providing the blocks 21 with the pairs ofgrooves 22 and reversely arranging the members of each pair of grooves,provision is made for the reversal of said blocks, and as a result thesame tool may be utilized for cutting both right and left hand threads.

To reverse the blocks it is only necessary to rotate adjusting ring 23so that the lugs 25 are disengaged from the cutter carrying blocks andthe latter may now be withdrawn from the ways 20 and after beingreversed are reinserted in said ways and ring 23 is now rotated toengage in the corresponding set of grooves 22 so as to adjust the cuttercarrying blocks radially relative to the opening in the tool thatreceives the work.

Thus it will be seen that I have provided a thread cutting die head orstock that is relatively simple in construction, inexpensive ofmanufacture, capable of being used as a hand stock or in a machine andwhich head or stock is provided with cutting dies or chasers which, inaddition to being easily and quickly adjusted, may be readily reversedso as to enable the tool to be utilized for cutting both right and lefthand threads.

It will be understood that minor changes in the size, form andconstruction of the various parts of my improved thread cutting diestock may be made and substituted for those herein shown and describedwithout departing from the spirit of my invention, the scope of which isset forth in the appended claims.

I claim as my invention:

1. In a thread cutting die stock, a face plate, a member securedthereto, which member is provided with radial grooves, blocks arrangedfor sliding movement in said grooves, thread cutting dies carried bysaid blocks said blocks being reversibly mounted in their grooves sothat the cutting dies carried thereby may be used for cutting left orright hand threads, grooves formed in the rear faces of said blocks, anadjusting ring arranged for rotation on the face plate to the rear ofsaid blocks and lugs projecting from said adjusting ring into thegrooves in said blocks. 7

2. In a thread cutting die stock, a face plate, a member securedthereto, which member is provided with radial grooves, blocks arrangedfor sliding movement in said grooves, thread cutting dies carried bysaid blocks which blocks are reversibly arranged in their grooves sothat the cutting dies carried by said blocks may be used for cuttingright or left hand threads, grooves formed in the rear faces of saidblocks, an adjusting ring arranged for rotation on the face plate to therear of said blocks, lugs projecting from said adjusting ring into thegrooves in said blocks and means for rotating said ring and for securingthe same to the face plate .after rotation.

for sliding movement in said ways, threadcutting dies detachably securedto said blocks said blocks being reversibly arranged in their" wayswhereby the cutting dies carried by said blocks may be used for cuttingleft or right-hand threads, each block being provided in its rear facewith a pair of reversely arranged grooves, an adjusting ring arranged onthe face plate and lugs projecting from said face plate into certain ofthe grooves in said blocks.

4:. In athread cutting die stock, a face plate, a member secured theretoand provided with radially disposed ways, blocks arranged for slidingmovement in said ways, thread cutting dies detachably secured to saidblockssaid blocks being reversibly arranged in their ways whereby thecutting dies carried by said blocks may be used for cutting left orright hand threads, each block being provided in its rear face with apair of reversely arranged grooves, an adjusting ring arranged on theface plate, lugs projecting from said face plate into certain of thegrooves in said blocks and meansfor rotating said adjusting ring andsecuring the same to the face plate after adjustment.

5, In a thread cutting die stock, a. face plate, a plurality ofreversible blocks mounted for radial sliding movement upon said face-plate,'studs projecting from said blocks, said studs beinglongitudinally slotted and provided withthreaded recesses the axes ofwhich studs are inclinedwith respect to the axis of the die stock,thread cutting dies mounted on said studs and tapered screws seated inthe threaded recesses of said slotted studs.

6. In a thread cutting 'die stock, a face plate, a plurality ofreversible blocks mounted for radial sliding movement upon said faceplate, studs projecting from said blocks, said studs beinglongitudinally slotted and provided with threaded recesses the axes ofwhich studs are inclined with respect to the axis of the die stock,thread cutting dies mounted on saidstuds, tapered screws seated in thethreaded recesses of said slotted studs and tapered washers seated inrecesses in the outer faces of said thread cutting dies beneath theheads of said screws.

7 7 In a thread cutting die stock, a block, a slotted stud projectingtherefrom the axis-of which stud is inclined with respect to the axis ofthe die stock, said stud being with a threaded recess, a thread cuttingdie mounted on said stud and provided inits outer face with a recessthat is'deeper on one sidethan the other, a split ring occupying saidrecess and a headed tapered screw seated in the threaded recess in saidstud with the head of said screw overlying said split ring.

provided i 8. In a thread cutt" die stock, a block, a slotted studprojecting therefrom the axis of which stud is inclined with respect tothe axis of the die stock, said'stud being provided with a threadedrecess, a thread cutting die mounted on said stud and provided in itsouter face wita a recess that is deeper on one side than the other, asplit ring occupying said recess, a headed tapered screw seated in thethreaded recess in said stud with the head of said screw overlying saidsplit ring and which split ring and slotted stud are provided withinterengaging corrugated faces.

9. In a thread cutting die stock, a face plate, a plurality ofreversible blocks mounted fol-radial adjustment upon said face plate, aninclined stud projecting outwardly from each block, circular threadcutting die mounted on each stud, the periphery of which die is notchedto provide an oppositely arranged pair'of cutting edges, a washer seatedin a recess in the outer face of each cutting die and surrounding theouter portion of said stud, said washer and stud having interengagingteeth and means seated in the stud for retaining the washer in therecess in said cutting die.

10. in a thread cutting die stock, a face plate, a plurality ofreversible blocks mounted for radial adjustment upon said face plate, aninclined stud projecting outwardly from each block, a circular threadcutting die mounted on each stud, the periphery of which die is notchedto provide an oppositely arranged pair of cutting edges, a washerseat-ed in a recess in the outer face of each cutting die andsurrounding the outer portion of said stud, said washer and stud havinginterengaging teeth, means seated in the stud for retaining the washerin the recess in said cutting die and the bottom of the recess in thedie and the inner face of the washer being correspondingly inclined.

11. In a thread cutting die stock, the combinationwith a face plate, ofa plurality of reversible blocks mounted for radial adjustment upon saidface plate, means between the face plate and blocks for'adjusting thelatter radially, an inclined stud projecting outwardly from each block,a double-edged thread cutting die mounted on said stud, there being arecess formed in the outer face of said die around the opening for thestud, a ring seated in said recess, the underface of which ring isinclined to correspond with the inclination of the bottom of the recessand interengaging teeth on said stud and ring.

12. In a thread cutting die stock, the combination with a face plate, ofa plurality of reversible blocks mounted for radial adjustment upon saidface plate, means between the face plate and blocks for adjusting thelatter radially, an inclined stud projecting outwardly from each block,a double-edged thread cutting die mounted on said stud,

there being a recess formed in the outer face of said die around theopening for the stud, a ring seated in said recess,'the underface ofwhich ring is inclined to correspond with the inclination of the bottomof the recess, interengaging teeth on said stud and ring and meansseated in the stud for retaining said ring in'said recess.

In testimony whereof I'aflix my signature;

l VILLIAM A. JENKINS.

